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https://www.readbyqxmd.com/read/29241088/development-of-an-lc-ms-method-to-quantify-coproporphyrin-i-and-iii-as-endogenous-biomarkers-for-drug-transporter-mediated-drug-drug-interactions
#1
Emmanuel Njumbe Ediage, Lieve Dillen, Ann Vroman, Luc Diels, Annett Kunze, Jan Snoeys, Tom Verhaeghe
Coproporphyrins are proposed as endogenous biomarkers of hepatic Organic Anion Transporting Polypeptide (OATP)1B functional activity. In this study, a new sample extraction method based on a mixed-mode anion exchange sorbent (SPE clean-up using Oasis 30mg Max 96 well plates) was developed for absolute quantification of coproporphyrin I and III (CP-I and CP-III) in human plasma. Chromatographic separation was performed with an Ace Excel 2 C18 PFP, 3μm, 2.1×150mm, maintained at 60°C. A 10mM ammonium formate containing 0...
December 6, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29240947/a-fth1-gene-pseudogene-microrna-network-regulates-tumorigenesis-in-prostate-cancer
#2
Jia Jia Chan, Zhi Hao Kwok, Xiao Hong Chew, Bin Zhang, Chao Liu, Tuck Wah Soong, Henry Yang, Yvonne Tay
Non-coding RNAs play a vital role in diverse cellular processes. Pseudogenes, which are non-coding homologs of protein-coding genes, were once considered non-functional evolutional relics. However, recent studies have shown that pseudogene transcripts can regulate their parental transcripts by sequestering shared microRNAs (miRNAs), thus acting as competing endogenous RNAs (ceRNAs). In this study, we utilize an unbiased screen to identify the ferritin heavy chain 1 (FTH1) transcript and multiple FTH1 pseudogenes as targets of several oncogenic miRNAs in prostate cancer (PCa)...
December 12, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/29240945/transcript-profiling-indicates-a-widespread-role-for-bacterial-type-phosphoenolpyruvate-carboxylase-in-malate-accumulating-sink-tissues
#3
Michael K Y Ting, Yi-Min She, William C Plaxton
Phosphoenolpyruvate carboxylase (PEPC) is an important regulatory enzyme situated at a key branch point of central plant metabolism. Plant genomes encode several plant-type PEPC (PTPC) isozymes, along with a distantly related bacterial-type PEPC (BTPC). BTPC is expressed at high levels in developing castor oil seeds where it tightly interacts with co-expressed PTPC polypeptides to form unusual hetero-octameric Class-2 PEPC complexes that are desensitized to allosteric inhibition by L-malate. Analysis of RNA-Seq and microarray transcriptome datasets revealed two distinct patterns of tissue-specific BTPC expression in vascular plants...
December 12, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/29240457/urinary-peptidomics-in-kidney-disease-and-drug-research
#4
Magdalena Krochmal, Joost P Schanstra, Harald Mischak
Due to its close connection with the renal system, urine is considered a valuable source of information in kidney disease research. Peptidomics methods focus on the discovery of endogenous peptides, given their wide range of biological functions and diagnostic and therapeutic potential. Representing a non-invasive and sensitive method, technological prospects of urinary peptidomics should be evaluated in the context of drug discovery and research. Areas covered: This review describes urinary peptidomics with focus on its application in drug research in the field of kidney diseases...
December 14, 2017: Expert Opinion on Drug Discovery
https://www.readbyqxmd.com/read/29240268/assessment-of-procoagulant-potential-in-patients-with-reactive-thrombocytosis-and-its-association-with-platelet-count
#5
Amihai Rottenstreich, Ela Shai, Geffen Kleinstern, Galia Spectre, David Varon, Yosef Kalish
OBJECTIVE: We aimed to determine hemostatic changes and characterize the procoagulant potential among reactive thrombocytosis (RT) patients. METHODS: Sixty RT patients (median platelet count 718X109 /L) and 20 healthy persons were tested for complete blood count, C-reactive protein, von Willebrand factor (VWF), factor VIII and fibrinogen, and thrombin generation. Platelet studies, including light transmission aggregometry and Cone and Plate(let) Analyzer, were also conducted...
December 14, 2017: European Journal of Haematology
https://www.readbyqxmd.com/read/29240231/the-issue-of-hplc-determination-of-endogenous-lipoic-acid-in-human-plasma
#6
Soňa Sechovcová, Pavla Královcová, Roman Kanďár, Karel Ventura
Lipoic acid (LA) is used extensively as a therapeutic agent for the treatment of various diseases. Many methods have been reported for the determination of LA plasma levels and its metabolites after its supplementation, but available information concerning endogenous plasma levels is still rare. Studies, which directly focused on determining the endogenous plasma levels, provided highly controversial results, less than 4.9 nmol/L or 143.7 - 197.0 nmol/L. The main aim of this study was to verify the levels of free LA in the plasma of 40 individuals (17 women, 23 men)...
December 14, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29239666/highly-selective-and-sensitive-measurement-of-active-forms-of-fgf21-using-novel-immunocapture-enrichment-with-lc-ms-ms
#7
Yue Zhao, Guowen Liu, Suk Kwok, Barry R Jones, Jane Liu, David Marchisin, Philip E Joyce, Jon Peterson, Jim X Shen
AIM: Recombinant FGF21 analogs are under wide ranging investigations as a potential therapeutic agent for Type 2 diabetes, as well as other metabolic disorders. The endogenous FGF21 is often used as a surrogate pharmacodynamic(PD) biomarker to assess drug efficacy and safety. Results/methodology: Immunocapture was performed using a monoclonal antibody which had been generated to bind to specific domain of native FGF21 as the capture reagent. After immunocapture, enzymatic digestion was performed and a native FGF21-specific tryptic peptide was monitored using LC-MS/MS by selective reaction monitoring...
December 14, 2017: Bioanalysis
https://www.readbyqxmd.com/read/29239517/nanoparticulate-delivery-of-cancer-cell-membrane-elicits-multiantigenic-antitumor-immunity
#8
Ashley V Kroll, Ronnie H Fang, Yao Jiang, Jiarong Zhou, Xiaoli Wei, Chun Lai Yu, Jie Gao, Brian T Luk, Diana Dehaini, Weiwei Gao, Liangfang Zhang
Anticancer vaccines train the body's own immune system to recognize and eliminate malignant cells based on differential antigen expression. While conceptually attractive, clinical efficacy is lacking given several key challenges stemming from the similarities between cancerous and healthy tissue. Ideally, an effective vaccine formulation would deliver multiple tumor antigens in a fashion that potently stimulates endogenous immune responses against those antigens. Here, it is reported on the fabrication of a biomimetic, nanoparticulate anticancer vaccine that is capable of delivering autologously derived tumor antigen material together with a highly immunostimulatory adjuvant...
December 2017: Advanced Materials
https://www.readbyqxmd.com/read/29239473/polyamines-regulating-phytic-acid-degradation-in-mung-bean-sprouts
#9
Ting Zhou, Pei Wang, Runqiang Yang, Zhenxin Gu
BACKGROUND: Polyamines are essentially involved in cell division and differentiation. Transport of polyamine is ATP dependent, while phytic acid is the major reserve of phosphate essential to the energy-producing machinery of cells. Thus, polyamines might enhance phytic acid degradation during mung bean germination. In this study, different polyamines [putrescine (Put), spermidine (Spd) and spermine (Spm)] and dicyclohexylamine (DCHA, a Spd synthesis inhibitor) were applied to investigate the function of polyamines on phytic acid degradation...
December 14, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29239336/neural-progenitor-cells-but-not-astrocytes-respond-distally-to-thoracic-spinal-cord-injury-in-rat-models
#10
Tara Nguyen, Yilin Mao, Theresa Sutherland, Catherine Anne Gorrie
Traumatic spinal cord injury (SCI) is a detrimental condition that causes loss of sensory and motor function in an individual. Many complex secondary injury cascades occur after SCI and they offer great potential for therapeutic targeting. In this study, we investigated the response of endogenous neural progenitor cells, astrocytes, and microglia to a localized thoracic SCI throughout the neuroaxis. Twenty-five adult female Sprague-Dawley rats underwent mild-contusion thoracic SCI (n = 9), sham surgery (n = 8), or no surgery (n = 8)...
November 2017: Neural Regeneration Research
https://www.readbyqxmd.com/read/29239312/endogenous-retinal-neural-stem-cell-reprogramming-for-neuronal-regeneration
#11
REVIEW
Romain Madelaine, Philippe Mourrain
In humans, optic nerve injuries and associated neurodegenerative diseases are often followed by permanent vision loss. Consequently, an important challenge is to develop safe and effective methods to replace retinal neurons and thereby restore neuronal functions and vision. Identifying cellular and molecular mechanisms allowing to replace damaged neurons is a major goal for basic and translational research in regenerative medicine. Contrary to mammals, the zebrafish has the capacity to fully regenerate entire parts of the nervous system, including retina...
November 2017: Neural Regeneration Research
https://www.readbyqxmd.com/read/29239169/one-step-in-situ-detection-of-mirna-21-expression-in-single-cancer-cells-based-on-biofunctionalized-mos2-nanosheets
#12
Gerile Oudeng, Manting Au, Jingyu Shi, Chunyi Wen, Mo Yang
Here, we report the one-step in-situ detection of targeted miRNAs expression in single living cancer cells via MoS2 nanosheets based fluorescence on/off probes. The strategy is based on the folic acid-polyethylene glycol (FA-PEG) functionalized MoS2 nanosheets with adsorbed dye-labeled single-stranded DNA (ssDNA). Once the nanoprobes are internalized into cancer cells, the hybridization between the probes and target miRNA results in the detachment dye-labeled ssDNA from MoS2 nanosheets surface, leading to the green fluorescence recovery...
December 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29238862/pursuing-extreme-sensitivity-for-determination-of%C3%A2-endogenous-brassinosteroids-through-direct-fishing-from-plant-matrices-and-eliminating-most-interferences-with-boronate-affinity-magnetic-nanoparticles
#13
Peiyong Xin, Bingbing Li, Jijun Yan, Jinfang Chu
Brassinosteroids (BRs) are important plant hormones regulating plant growth and development. High-performance analytical methods for quantifying endogenous BRs are important for studying the molecular mechanisms of BR action. Herein we developed a high-performance sample pretreatment method based on boronate affinity magnetic nanoparticles (BAMNPs). The high specificity of boronate affinity enables direct fishing of BRs from plant matrices. The strong binding energy makes it possible to remove most contaminants in plant matrices with a small loss of target BRs...
December 14, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29238724/dna-damage-as-a-driver-for-growth-delay-chromosome-instability-syndromes-with-intrauterine-growth-retardation
#14
REVIEW
Benilde García-de Teresa, Mariana Hernández-Gómez, Sara Frías
DNA is constantly exposed to endogenous and exogenous mutagenic stimuli that are capable of producing diverse lesions. In order to protect the integrity of the genetic material, a wide array of DNA repair systems that can target each specific lesion has evolved. Despite the availability of several repair pathways, a common general program known as the DNA damage response (DDR) is stimulated to promote lesion detection, signaling, and repair in order to maintain genetic integrity. The genes that participate in these pathways are subject to mutation; a loss in their function would result in impaired DNA repair and genomic instability...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29238290/intermittent-fasting-protects-against-alzheimer-s-disease-possible-through-restoring-aquaporin-4-polarity
#15
Jingzhu Zhang, Zhipeng Zhan, Xinhui Li, Aiping Xing, Congmin Jiang, Yanqiu Chen, Wanying Shi, Li An
The impairment of amyloid-β (Aβ) clearance in the brain plays a causative role in Alzheimer's disease (AD). Polarity distribution of aquaporin-4 (AQP4) is important to remove Aβ from brain. AQP4 polarity can be influenced by the ratio of two AQP4 isoforms M1 and M23 (AQP4-M1/M23), however, it is unknown whether the ratio of AQP4-M1/M23 changes in AD. Histone deacetylase 3 has been reported to be significantly increased in AD brain. Moreover, evidence indicated that microRNA-130a (miR-130a) possibly mediates the regulation of histone deacetylase 3 on AQP4-M1/M23 ratio by repressing the transcriptional activity of AQP4-M1 in AD...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/29238104/indole-3-propionic-acid-suppresses-indoxyl-sulfate-induced-expression-of-fibrotic-and-inflammatory-genes-in-proximal-tubular-cells
#16
Maimaiti Yisireyili, Kyosuke Takeshita, Shinichi Saito, Toyoaki Murohara, Toshimitsu Niwa
Indoxyl sulfate (IS) induces fibrosis and inflammation in kidneys via oxidative stress through the induction of transforming growth factor-β1 (TGF-β1) and monocyte chemotactic protein-1 (MCP-1). Furthermore, IS is a potent endogenous agonist for aryl hydrocarbon receptor (AHR), which regulates the transcription of genes such as cytochrome P450 (CYP) 1A1. Indole-3-propionic acid (IPA) is an antioxidant and has been reported to be neuroprotective. We determined whether IPA suppresses IS-induced expression of AHR, CYP1A1, TGF-β1, and MCP-1 in proximal tubular cells...
November 2017: Nagoya Journal of Medical Science
https://www.readbyqxmd.com/read/29238035/long-non-coding-rna-meg3-functions-as-a-competing-endogenous-rna-to-regulate-ischemic-neuronal-death-by-targeting-mir-21-pdcd4-signaling-pathway
#17
Honglin Yan, Jie Rao, Jingping Yuan, Likun Gao, Wenxian Huang, Lina Zhao, Jiacai Ren
Long non-coding RNA (lncRNA) maternally expressed gene 3 (MEG3) has been demonstrated as an important regulator in diverse human cancers. However, its function and regulatory mechanism in ischemic stroke remains largely unknown. Here, we report that MEG3 is physically associated with microRNA-21 (miR-21), while miR-21 is downregulated following ischemia in the ischemic core in vitro and in vivo, which is opposite to MEG3. Besides, overexpression of miR-21 protects oxygen-glucose deprivation and reoxygenation (OGD/R)-induced apoptotic cell death...
December 13, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/29238034/inverse-relationship-between-serum-bilirubin-levels-and-diabetic-foot-in-chinese-patients-with-type-2-diabetes-mellitus
#18
Jifan Chen, Jian Wang, Xingxing Zhang, Hong Zhu
BACKGROUND Several studies demonstrated that bilirubin, a potent endogenous antioxidant, is a strong protective factor for many diabetic complications such as nephropathy, retinopathy, neuropathy, and vasculopathy. The purpose of this study was to assess the association between serum bilirubin levels and diabetic foot (DF) in Chinese patients with type 2 diabetes mellitus (T2DM). MATERIAL AND METHODS The present cross-sectional study of bilirubin levels in relation to DF was conducted in 1,269 T2DM patients with (n=578) and without (n=691) DF...
December 14, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29237837/molecular-dynamics-and-mode-of-transmission-of-koala-retrovirus-korv-as-it-invades-and-spreads-through-a-wild-queensland-koala-population
#19
Bonnie Chaban, Vanissa A Ong, Jonathan Hanger, Peter Timms
The recent acquisition of a novel retrovirus (KoRV) by koalas (Phascolarctos cinereus) has created new opportunities for retroviral research and new challenges for koala conservation. There are currently two major subtypes of KoRV; KoRV-A, which is believed to be endogenous only in koalas from the northern part of Australia, and KoRV-B, which appears to be exogenous. Understanding and management of these subtypes requires population-level studies of their prevalence and diversity, especially when co-infected in the same population, and investigations of their modes of transmission in the wild...
December 13, 2017: Journal of Virology
https://www.readbyqxmd.com/read/29237803/anti-tumor-activity-of-entrectinib-a-pan-trk-ros1-and-alk-inhibitor-in-etv6-ntrk3-positive-acute-myeloid-leukemia
#20
Kristen M Smith, Patrick C Fagan, Elena Pomari, Giuseppe Germano, Chiara Frasson, Colin Walsh, Ian M Silverman, Paolo Bonvini, Gang Li
Activation of tropomyosin receptor kinase (TRK) family tyrosine kinases by chromosomal rearrangement has been shown to drive a wide range of solid tumors and hematologic malignancies. TRK fusions are actionable targets as evidenced by recent clinical trial results in solid tumors. Entrectinib (RXDX-101) is an investigational, orally available, CNS-active, highly potent and selective kinase inhibitor against TRKA/B/C, ROS1 and ALK kinase activities. Here, we demonstrate that TRK kinase inhibition by entrectinib selectively targets preclinical models of TRK fusion-driven hematologic malignancies...
December 13, 2017: Molecular Cancer Therapeutics
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